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Venus was discovered in 1610
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The first observation of the transit of venus was in 1639
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In 1958 venuses high surface temperatures were measured by using radio measurements.
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In 1961 venuses rotation period was measured by radar
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In 1962 high space temperature is measured by mariner 2 as it flew past Venus.
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In 1970 Venera 7 lands sendig data back to Earth about Venus.
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In 1974 the clouds on Venus were photographed by mariner as it flew past.
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Venuses surface rocks and soilis analised by Venera 13 and Venera 14.